Only the motor to controller cables or the battery cables as well? Are all terminals clean and free of any corrosion? Do the cables have the correct 5/16” ring terminals? How hot are they getting? Can you touch them without burning your fingers?

Do you have a diode on the solenoid coil - if so is it oriented correctly. If you did not mess with it or replace it then no issue there.

The cables do not seem overly hot to me...

Lets make sure your MCOR is not going out. Unplug the two pin connector from the MCOR (under the floor and connected to a linkage from the pedal) and jump out the connector with a paper clip or a small piece of wire. It will be a blue wire and green wire connector. If it runs with the jumper in place, your MCOR has failed. Get one here https://www.revolutiongolfcars.com/mcors